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<br />ADDITIONAL INFORMATION <br /> <br />Water supply forecasts take inta cansideratian present hydrometeorolagical canditions and use average <br />basin temperatures and precipitation far the forecast period. As the farecast season progresses, a greater <br />portion af the future hydrolagic and climatic uncertainty becames knawn and manthly forecasts become <br />more accurate. <br /> <br />Valume forecasts represent adjusted flaws; that is, observed flaws with upstream water use taken into <br />accaunt. Adjusted flaws will closely appraximate natural ar unimpaired flows. Hawever, not all <br />upstream diversions ar impaundments are measured or quantifiable. Far specific adjustments used with <br />each forecast point, consult the Guide to Water Supply Farecasting. <br /> <br />The Water Supply Outlaok is issued manthly January through May by the Colarada Basin River <br />Forecast Center, Natianal Weather Service. It represents a caordinated cffor! between the National <br />Weather Service, Natural Resaurces Canservatian Service, Bureau of Reclamation, U.S. Geolagical <br />Survey and lacal water district managers. <br /> <br />DEFINITIONS: <br /> <br />Acre-Faot: <br />The volume equal ta ane acre cavered one faot deep (43,560 cubic feet), <br /> <br />Average: <br />The arithmetic mean. The sum af the values divided by the number of values. <br /> <br />Categories: <br />Much abave Average <br />Greater than 130% <br /> <br />Abave Average <br />111-130% <br /> <br />Near Average Below Average <br />90-110% 70-89% <br /> <br />Much below Average <br />Less than 70% <br /> <br />Forecast Periad: <br />The periad from April I through July 31. <br /> <br />Median: <br />The middle value. One half af the observed values are higher and half of the values are lawer than this. <br /> <br />Mast Prabable Farecast: <br />Given the current hydrometearolagical conditions to date, this is the best estimate af what the runoff <br />volume will be this seasan. <br /> <br />Reasanable Maximum Forecast: <br />Given the current hydrometeoralagical canditians, the seasonal runoff that has a ten percent (10%) <br />chance of being exceeded. <br /> <br />Reasanable Minimum Farecast: <br />Given the current hydrometearalogical canditions, the seasanal runaff that has a ninety percent (90%) <br />chance af being exceeded. <br /> <br />Water Year: <br />The peri ad from Octaber I through September 30. <br /> <br />NOTE: Data used in this repart are pravisianal and are subiect ta revision. <br /> <br />For mare information, ar ta be included on the mailing list, please contact: <br /> <br />Calorada Basin River Farecast Center. Natianal Weather Service <br />2242 W. Narth Temple ",Salt Lake City, UT 84116" (801) 524-5130 <br /> <br />Colarada Basin River Farecast Center - Natianal Weather Service <br /> <br />Page 16 <br />